Tekonsha Bargman Company 119251 Modulite Zci Trailer Lite Power Activates a trailer's stop/turn/tail/running lights without cutting or splicing into your vehicles wiring system - simply snap on included current sensors Use when: trailer has more than 1 light assembly per side and is equipped with multiple clearance or running lights; if tow vehicle may tow a variety of trailers; if tow vehicle has 'lamp out' sensors Re-settable short circuit/overload protection - guards itself and the tow vehicle from shorts and wiring install mishaps; rated at 4.2 amps for turn/stop circuits, 7.5 amps for taillight circuit Works on all vehicle types including standard, PWM and/or multiplex systems, ensuring full brightness of the trailer lights during operation; can be used on 2 or 3 wire systems Works with either LED and/or incandescent bulbs (vehicle & trailer); includes complete installation kit and comprehensive instructions; backed by Tekonsha's 1 Year Limited Warranty ZCI sensor technology and direct connection to the tow vehicle battery, eliminates all electrical connection and interference with the tow vehicle electrical system Vehicles with 12 volt system only Isolates trailer light operation from tow vehicle's electrical system 2 amps for turn/stop &amp; 7 5 amps for taillight trailer circuits. Works with low side Switched vehicles